Blue screen and red 1" key in bottom left hand corner

I turned on my tv to discover that it has an all blue screen with a 1-2" key symbol in the bottom left hand side of the screen. The tv cannot be turned on or off manually only with the remote and no other buttons work except the power button on the remote. I don't believe that i ever set any parental controls as i have no children. I unplugged it for 24 hrs and turned it back on to receive the same problem. Not sure where to go from there i read that sometimes you need to take the cover off and remove the internal battery is that wise?

If you have a blank screen with a red key on the bottom left, simply press the (function or F) button and the mute button at the same time. This will unlock the screen and allow you to view the channel as desired.

If your TV asks for a 4-digit code or password please enter 3308 or 6688 to unlock the screen or reset any preset rating levels.

If you have a GT2011J or GT2011S Television, hold the (Display) button for 10 seconds, it will unlock the screen. If password or code is requested, try 3308 or 6688.

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If you have a blank screen with a red key on the bottom left, simply press the (function or F) button and the mute button at the same time. This will unlock the screen and allow you to view the channel as desired.

If your TV asks for a 4-digit code or password please enter 3308 or 6688 to unlock the screen or reset any preset rating levels.

If you have a GT2011J or GT2011S Television, hold the (Display) button for 10 seconds, it will unlock the screen. If password or code is requested, try 3308 or 6688.

Somehow in handling the remote control I pushed a button or combination of buttons and now have a blue screen with a lock symbol in red in the top left hand corner. I've tried turning the tv off, and unplugging it, as well as a combination of buttons on the remote, but it still is there.What do I need to do to remove the lock?

gonk,
Sorry but you're going to have to be a bit more specific than that.. What kind of Tv is it, what model number, is it the original remote, do you have an otherwise good pic and sound, do functions (vol, ch, power) on the Tv work???
Bill